INFRARED_RECEIVER

Published:2009/7/1 0:56:00 Author:May | From:SeekIC

The circuit consists of Q1-a phototransistor that responds to an intensity of amplitude-modulated IR light source-and a three-stage, high-gain audio amplifier.Transformer T1 is used to match the output impedance of the receiver to today's popular low-impedance (low-Z) headphones; but if a set of 1000-2000 ohm, magnetic (not crystal), high-impedance (high-Z) phones are to be used, remove T1 and connect the high-Z phones in place of T1's primary winding-the 1000-ohm winding.



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